This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 7 |
| 4 | 40 |
| 5 | 92 |
| 6 | 532 |
| 7 | 1999 |
| 8 | 10150 |
| 9 | 46226 |
| 10 | 234484 |
| 11 | 1167106 |
| 12 | 6013755 |
| 13 | 31027951 |
| 14 | 161979950 |
| 15 | 848039052 |
| 16 | 4458470286 |
| 17 | 23481316334 |
| 18 | 123866264459 |
| 19 | 653972874084 |
| 20 | 3454977358732 |
| 21 | 18260006314624 |
| 22 | 96532215568355 |
| 23 | 510408646716334 |